Russian to Spanish Math Text Proofreading

I'm seeking an experienced proofreader and translator to review and translate an Algebra & Basic Arithmetic document from Russian to Spanish. The document is in a standard document file format (Google Docs). The primary focus of the task is to correct any grammatical and stylistic errors in the text. Also I need the two texts be absolutely in the same format.

Ideal candidates for this project should:
- Have a strong command of both Russian and Spanish, with a particular focus on grammar and syntax.
- Be familiar with Basic Math to ensure that mathematical concepts are accurately represented in the translation.
- Be able to work with document files (Google Docs) and have experience proofreading and translating similar texts.

Please note that while the primary purpose of the task is correcting grammatical errors, a keen eye for improving the overall readability of the text would be advantageous.

Here is a link to a sample document in Spanish:
https://docs.google.com/document/d/1sUIfYm2iTU72nDBxTiNt7Jd7yuJCf0ZgI0KGZqzV40Q/edit?usp=sharing

Here is Russian version:
https://docs.google.com/document/d/1gzgZTm_PqN-Pfw9KfvM_JObiRpnKy12m/edit?usp=drive_link&ouid=104314716053821534219&rtpof=true&sd=true

I will share a folder with Google Documents with you and you correct the Spanish version right there.
There are 102 documents (0.4 - 1.5 pages each), it is about 40K words, but there are a lot of math symbols there (no need to translate or check).